An example image forming apparatus includes a coupling device to perform coupling or decoupling between the image forming apparatus and a consumable, a sensor to sense an opening of a cover of the image forming apparatus, and a processor. When receiving an opening sensing signal of the cover from the sensor, the processor determines whether the consumable coupled to the image forming apparatus corresponds to a consumable access condition, and based on a result of determination, transmits a signal requesting decoupling of the consumable corresponding to the consumable access condition to the coupling device.